Invention Grant
- Patent Title: Magnetic core and coil design for double perpendicular magnetic recording (PMR) writers
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Application No.: US15874986Application Date: 2018-01-19
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Publication No.: US10311900B1Publication Date: 2019-06-04
- Inventor: Kowang Liu , Yuhui Tang , Moris Dovek
- Applicant: Headway Technologies, Inc.
- Applicant Address: US CA Milpitas
- Assignee: Headway Technologies, Inc.
- Current Assignee: Headway Technologies, Inc.
- Current Assignee Address: US CA Milpitas
- Agency: Saile Ackerman LLC
- Agent Stephen B. Ackerman
- Main IPC: G11B5/127
- IPC: G11B5/127 ; G11B5/17 ; G11B5/39 ; G11B5/48 ; G11B5/31 ; G11B5/00

Abstract:
A dual PMR writer is disclosed wherein the better of the two writers on a slider is integrated into a head gimbal assembly to improve area density capability mean and sigma values, and the other writer is disabled. Each of a driving coil (DC) and bucking coil (BC) have two outer portions that form a U shape with a front side, and have a center portion connected to each of the two outer portions with a narrow arm in which direct current resistance (DCR) is enhanced during a write process. As a result, when writer (coil) induced write gap (WG) protrusion is overlaid on the dynamic fly height (DFH) protrusion profile, the net WG protrusion profile has a maximum value at a cross-track position aligned with a main pole tip in the better writer thereby substantially minimizing magnetic spacing loss compared with conventional dual PMR writers.
Information query
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